It is proper Netiquette to check the signal strength before you stream. Do make sure you have enough bandwidth.
The strength of a given signal determines how fast video and music content will stream. Low signal strength mean that the stream may be interrupted often to download content into the buffer.
Many people check the signal strength before streaming with mobile devices because low signals cause interruptions to streams. Low signals can be frustrating when trying to perform high bandwidth operations from Wi-Fi or other mobile internet connection.
Check the signal strength before you stream because you can't stream with a low signal.